Novel Control Design for Simultaneous Damping of Inter-area and Forced Oscillation

Forced oscillation (FO) has recently been detected in actual power systems, e.g., Nordic and Western American power systems. It is reported that the FO is excited by forced disturbances which consist of the frequencies nearly equal to inter-area oscillation frequencies. Although the damping ratio of inter-area mode is well damped, the FO can lead to severe resonance in the system. These major events lead to intensive research in such a problem. Numerous techniques have been successfully applied for FO detection. However, a small number of works have focused on the damping of FOs. Without proper control action for FO, it may lead to instability. In this paper, the proposed power oscillation damper (POD) is designed to simultaneous damping of the FO and inter-area mode. Without the installation of additional PODs, the adaptive control technique is applied to enhance the FO mode along with moving window time. Besides, the event-triggered control strategy is used to activate the functions of the new adaptive POD appropriately. The simulation results are verified in the modified 14-Machine South East Australian (SE-A) power system under various system uncertainties and disturbances.